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Here is the original paper on DTLS, the security basis for CoAP/UDP from Nagendra Modadugu and Eric Rescorla:

Applications that are based on reliable transport can be secured using TLS, but no compelling alternative exists for securing datagram-based applications. In this paper we present DTLS, a datagram-capable version of TLS.

Well written.

Mark Benson speaking photo

About Mark Benson

Mark Benson is Head of Samsung SmartThings, author of The Art of Software Thermal Management for Embedded Systems, and is a regular speaker and writer on leadership, organizational behavior, and the future of the smart home.

Read more about Mark in the preface